Alpinestars Helmets Size Chart

Road & MX Helmets
Size	Head Circumference (cm)	Head Circumference (in)
XS	53 - 54	20.8" - 21.2"
S	55 - 56	21.6" - 22"
M	57 - 58	22.4" - 22.8"
L	59 - 60	23.2" - 23.6"
XL	61 - 62	24" - 24.4"
2XL	63 - 64	24.8" - 25.2"

Vector Series (MTB/ATB)
Size	Head Circumference (cm)	Head Circumference (in)
S	51 - 55	20" - 21.6"
M	55 - 59	21.6" - 23.2"
L	59 - 63	23.2" - 24.8"

Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.